Reasons For

The Panasonic TX-50DX700 has a motion interpolation frequency of 1,400Hz, however the Panasonic TX-55DX600 is only an 800Hz motion interpolation frequency TV (600Hz slower).
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The motion interpolation frequency is the frame rate which the TV is able to artificially create by inserting additional frames into the picture between the frames included in the original video source. Motion interpolation technology can sometimes create some unwanted side effects such glitches when the technology suddenly activates during an action scene. Most modern TVs will have an option to switch off the motion interpolation if it is not desired.

A faster motion interpolation frequency will result in smoother action scenes, less motion blur and a more life like image.

One more USB 2.0 port
Edit

The number of USB 2.0 ports on the Panasonic TX-50DX700 is two, but the Panasonic TX-55DX600 only has one USB 2.0 port.
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USB ports are useful for displaying on your TV photos / videos or playing music that is stored on USB key drives. The USB port can also be used for charging devices from your TV (as long as it's switched on), and for installing software updates on the TV.

More USB ports will allow you to connect more USB devices to the TV simultaneously without needing to continuous plug in and unplug cables.

A lot lower annual energy consumption
Edit

The Panasonic TX-50DX700 has an annual energy consumption of 123kWh, whereas the Panasonic TX-55DX600 is a 160kWh annual energy consumption TV (37kWh higher).
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The annual energy consumption is the total amount of energy that the TV will use over the course of a whole year, given typical usage levels.

A lower annual energy consumption means that it will cost less each year for you to run your TV.

Lower power consumption when switched off
Edit

The Panasonic TX-50DX700 is a 0.3W power consumption when switched off TV. That's 0.2W lower than the Panasonic TX-55DX600 (0.5W).

Lighter
Edit

Panasonic TX-50DX700 is 16kg heavy, but the Panasonic TX-55DX600 is an 18kg heavy TV (2kg heavier).
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The weight is the total weight of the TV excluding all packaging.

A lighter weight TV will be easier to move around and to mount on a wall. Some of the larger, very heavy TVs may require lightweight partition walls to be reinforced before the TV could be mounted.

Cheaper by £59

The Panasonic TX-50DX700 is £59.01 cheaper than the Panasonic TX-55DX600.

10 shops are selling it

A greater number of sellers increases the price competition amongst retailers for the product and also increases the chances of this TV remaining in stock.

Cheaper to run by £43.26

Over five years the Panasonic TX-50DX700 only costs £144.05 to run however the Panasonic TX-55DX600 costs £187.31 to run (30% more).
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The Panasonic TX-50DX700 has an energy efficiency rating of "A", whereas the Panasonic TX-55DX600 has a rating of "A".

3 Reasons For

Larger screen size
Edit

The Panasonic TX-55DX600 is a 55" TV. That's 5" larger than the Panasonic TX-50DX700 (55").
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The display diagonal of a TV is the most common measure of screen size and is the distance from the top left to the bottom right of the visible part of a TV screen excluding any frame or border. One of the most important considerations when choosing the right screen size for your TV is the typical distance from which you will be viewing the screen.
A good rule of thumb is to multiply the display diagonal by 2.5 to determine the viewing distance. So a 40 inch TV is best viewed from 100 inches away, which is equivalent to 8.3 feet or 2.54m.
For home cinema setups and a truly immersive experience this ratio can be reduced to 1.2. This will give a screen size that fills 40 degrees of the viewer's field of vision. So if you viewing from a distance of 6ft (72 inches) you would need a TV display diagonal of 60 inches.

TVs with a bigger display diagonal allow you to make the most of HD content and are great for watching movies.

The energy efficiency rating of the Panasonic TX-55DX600 is "A", but the rating of the Panasonic TX-50DX700 is "A".

Reasons Against

2 Reasons Against

5" smaller screen size
Edit

The Panasonic TX-50DX700 has a screen size of 50", but the Panasonic TX-55DX600 is a 55" TV (5" larger).
Read more

The display diagonal of a TV is the most common measure of screen size and is the distance from the top left to the bottom right of the visible part of a TV screen excluding any frame or border. One of the most important considerations when choosing the right screen size for your TV is the typical distance from which you will be viewing the screen.
A good rule of thumb is to multiply the display diagonal by 2.5 to determine the viewing distance. So a 40 inch TV is best viewed from 100 inches away, which is equivalent to 8.3 feet or 2.54m.
For home cinema setups and a truly immersive experience this ratio can be reduced to 1.2. This will give a screen size that fills 40 degrees of the viewer's field of vision. So if you viewing from a distance of 6ft (72 inches) you would need a TV display diagonal of 60 inches.

TVs with a bigger display diagonal allow you to make the most of HD content and are great for watching movies.

Only one USB 3.0 (3.1 Gen 1) Type-A port
Edit

The number of USB 3.0 (3.1 Gen 1) Type-A ports on the Panasonic TX-50DX700 is one, but the Panasonic TX-55DX600 only has two USB 3.0 (3.1 Gen 1) Type-A ports.

9 Reasons Against

Slower motion interpolation frequency
Edit

The Panasonic TX-55DX600 is an 800Hz motion interpolation frequency TV. That's 600Hz slower than the Panasonic TX-50DX700 (800Hz).
Read more

The motion interpolation frequency is the frame rate which the TV is able to artificially create by inserting additional frames into the picture between the frames included in the original video source. Motion interpolation technology can sometimes create some unwanted side effects such glitches when the technology suddenly activates during an action scene. Most modern TVs will have an option to switch off the motion interpolation if it is not desired.

A faster motion interpolation frequency will result in smoother action scenes, less motion blur and a more life like image.

Only one USB 2.0 port
Edit

The Panasonic TX-55DX600 has one USB 2.0 port, however the Panasonic TX-50DX700 only has two USB 2.0 ports.
Read more

USB ports are useful for displaying on your TV photos / videos or playing music that is stored on USB key drives. The USB port can also be used for charging devices from your TV (as long as it's switched on), and for installing software updates on the TV.

More USB ports will allow you to connect more USB devices to the TV simultaneously without needing to continuous plug in and unplug cables.

Higher annual energy consumption
Edit

The Panasonic TX-55DX600 is a 160kWh annual energy consumption TV. That's 37kWh higher than the Panasonic TX-50DX700 (160kWh).
Read more

The annual energy consumption is the total amount of energy that the TV will use over the course of a whole year, given typical usage levels.

A lower annual energy consumption means that it will cost less each year for you to run your TV.

A lot higher power consumption when switched off
Edit

The Panasonic TX-55DX600 has a power consumption when switched off of 0.5W, but the Panasonic TX-50DX700 is a 0.3W power consumption when switched off TV (0.2W lower).

12% heavier
Edit

The Panasonic TX-55DX600 has a weight of 18kg. That's 2kg heavier than the Panasonic TX-50DX700 (18kg).
Read more

The weight is the total weight of the TV excluding all packaging.

A lighter weight TV will be easier to move around and to mount on a wall. Some of the larger, very heavy TVs may require lightweight partition walls to be reinforced before the TV could be mounted.

£59 more expensive

The Panasonic TX-55DX600 is more expensive than the Panasonic TX-50DX700 by £59.01.